Aon plc — Director's Dealing 2010

Nov 1, 2010

SEC Form 4/A — Form 4/A

Issuer: AON CORP (AOC)
CIK: 0000315293
Period of Report: 2010-10-01

Reporting Person: FRANCIS CHERYL A (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-10-01	Common Stock	A	3448	—	Acquired	3448	Direct
2010-10-01	Common Stock	A	1454	—	Acquired	4902	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-10-01	Deferred Stock Unit Award	$	A	4327.9022	Acquired		Common Stock (4327.9022)	Direct

Footnotes

F1: Received pursuant to the Agreement and Plan of Merger, dated as of July 11, 2010, among Aon Corporation ("Aon"), Alps Merger Corp., Alps Merger LLC and Hewitt Associates, Inc. (the "Merger Agreement") in exchange for 4,602 shares of Hewitt common stock held directly. On the effective date of the merger, the closing price of Aon's common stock was $39.28.

F2: Received pursuant to the Merger Agreement in exchange for 2,287 shares of Hewitt common stock resulting from the settlement of Hewitt restricted stock units. On the effective date of the merger, the closing price of Aon's common stock was $39.28.

F3: The deferred stock units convert to shares of common stock on a 1-for-1 basis.

F4: The deferred stock units represent an outside director stock award granted upon the commencement of service of a non-employee director of Aon Corporation.

F5: The deferred stock units vest over a one-year period, and will convert to and be paid in shares of Aon common stock upon the earlier of: (a) the third anniversary of the date of grant; or (b) the director's termination of service from the Board, unless a timely deferral election is made.

F6: The amount in column 4 of row 1 is being revised to reflect the number of shares issued to the reporting person following the calculation of the final election results pursuant to the terms of the Merger Agreement. The amount shown in column 4 of row 1 of the original filing was an estimate based on preliminary election results. The revised number of shares is also reflected in the amount shown in column 5 of each of rows 1 and 2.